U2043B Datasheet, PDF (1/10 Pages) TEMIC Semiconductors – Flasher, 30-mohm Shunt, Pilot Lamp to GND or V Batt

Features
• Temperature and Voltage Compensated Frequency
• Warning Indication of Lamp Failure by Means of Frequency Doubling
• Minimum Lamp Load for Flasher Operation ≥ 10W
• Relay Output with High Current Carrying Capacity and Low Saturation
Voltage
• Low Susceptibility to EMI
1. Description
The integrated circuit U2043B is used in relay-controlled automotive flashers where a
high EMC level is required. A lamp outage is indicated by frequency doubling during
hazard mode as well as direction mode. The pilot lamp can be connected either to
V_Batt or GND.
Figure 1-1. Block Diagram
C₁
4
6
Measuring comparator
K ₁ ^V 6^{-81 mV}
2
7
R_{3 30 m Ω}
Shunt
+ V_S
+ 49
Pilot lamp 5 W
Pulse
R₁
generator
3.8 k Ω
K ₃ V ₆-5 V
5
49 a-Comparator
23 V
IC Ground
3
Relay
8
R₂
3.3 k Ω
1
R₁
100 Ω
GND
- 31
49 a
5 W 21 W 21 W
21 W 21 W 5 W
Indicator lamps
Pilot lamps
Flasher, 30 mΩ
Shunt, Pilot
Lamp to GND or
V_Batt
U2043B
Rev. 4720B–AUTO–09/05